Bi2O3/Bi2O2CO3催化剂的制备及其光催化降解性能

Preparation and photocatalytic performance of Bi2O3/Bi2O2CO3 photocatalyst

采用水热法制备Bi2O3/Bi2O2CO3复合光催化剂,通过XRD、SEM等表征手段研究其晶型及形貌等.通过XRD分析可知,所制备的Bi2O3/Bi2O2CO3复合光催化剂的衍射峰能够对应(JCPDS:41-1448)相关晶面,并且能够观察到Bi2O3的特征峰,说明Bi2O3/Bi2O2CO3光催化剂较好的制备.在可见光下降解RhB溶液,当Bi2O3的负载量为10 wt%,降解率高达90%.实验结果表明,在相同条件下,将Bi2O3引入到Bi2O2CO3后,光催化降解率明显提升.Bi2O3/Bi2O2CO3复合光催化剂光催化活性的提升可能归因于光生电荷的快速迁移和比表面积的增大.并且经过5次循环实验后,Bi2O3/Bi2O2CO3光催化剂降解率为84.6%,说明其具有较高的稳定性.此外,自由基捕获实验的结果表明,Bi2O3/Bi2O2CO3催化剂的主要活性物种为h+,进而提出可能的光催化机理.

The Bi2O3/Bi2O2CO3 composite photocatalyst was prepared by hydrothermal method,and its crystal form and morphology were studied by XRD and SEM.XRD analysis showed that the diffraction peak of the prepared Bi2O3/Bi2O2CO3 composite photocatalyst could correspond to the(JCPDS:41-1448)related crystal plane,and the characteristic peak of Bi2O3 could be observed,indicating that the Bi2O3/Bi2O2CO3 photocatalyst was better prepared.The RhB solution was degraded under visible light.When the loading of Bi2O3 was 10 wt%,the degradation rate was as high as 90%.The experimental results show that under the same conditions,the photocatalytic degradation rate of Bi2O3 is significantly improved after Bi2O3 is introduced into Bi2O2CO3.The increase of photocatalytic activity of Bi2O3/Bi2O2CO3 composite photocatalyst may be attributed to the rapid migration of photogenerated charge and the increase of specific surface area.And after 5 cycles of experiments,the degradation rate of Bi2O3/Bi2O2CO3 photocatalyst was 84.6%,indicating that it has high stability.In addition,the results of free radical trapping experiments show that the main active species of Bi2O3/Bi2O2CO3 catalyst is h+,and a possible photocatalytic mechanism is proposed.